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util.go
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util.go
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package main
import (
"bytes"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"net"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"text/template"
"github.com/golang-jwt/jwt/v4"
)
var ErrCantSolve = errors.New("cannot to solve request param")
var ErrValueNotSet = errors.New("parameter value not set")
var tmplCache = map[string]*template.Template{}
func GetRequestParam(param string, req *http.Request) (value string, solved bool, err error) {
if os.Getenv("DEBUG_GET_REQ_PARAM") != "" {
logf(req, logLevelInfo, "GetRequestParam %#v", param)
}
if strings.HasPrefix(param, "str:") {
return param[4:], true, nil
} else if strings.HasPrefix(param, "auth:") {
authHeaders := req.Header.Values("Authorization")
if len(authHeaders) == 0 {
return "", false, ErrValueNotSet
}
switch param[5:] {
case "bearer":
for _, v := range authHeaders {
if strings.HasPrefix(v, "Bearer ") {
return v[7:], true, nil
}
}
case "basic-pwd", "basic-usr":
usr, pwd, ok := req.BasicAuth()
if !ok {
return "", false, ErrValueNotSet
}
switch param[5+6:] {
case "pwd":
return pwd, true, nil
case "usr":
return usr, true, nil
}
}
return "", false, ErrValueNotSet
} else if strings.HasPrefix(param, "crt:") {
if req.TLS == nil {
logf(req, logLevelError, "cannot get X.509 data from non-TLS request")
return "", false, ErrCantSolve
}
if req.TLS.PeerCertificates == nil || len(req.TLS.PeerCertificates) == 0 {
logf(req, logLevelError, "want set claim from X509 %s, but there are no client certificate", param[4:])
return "", false, ErrCantSolve
}
crt := req.TLS.PeerCertificates[0]
switch param[4:] {
case "cn":
return crt.Subject.CommonName, true, nil
case "subj":
return crt.Subject.String(), true, nil
case "fp":
h := sha256.New()
h.Write(crt.Raw)
return hex.EncodeToString(h.Sum(nil)), true, nil
case "crt":
return base64.StdEncoding.EncodeToString(crt.Raw), true, nil
default:
logf(req, logLevelWarning, "crt param %#v not in: cn, subj, fp, crt", param[4:])
}
} else if strings.HasPrefix(param, "q:") {
if !req.URL.Query().Has(param[2:]) {
return "", false, ErrValueNotSet
}
return req.URL.Query().Get(param[2:]), true, nil
} else if strings.HasPrefix(param, "post:") {
req.ParseForm()
if !req.PostForm.Has(param[5:]) {
return "", false, ErrValueNotSet
}
return req.PostFormValue(param[5:]), true, nil
} else if strings.HasPrefix(param, "hdr:") {
if len(req.Header.Values(param[4:])) == 0 {
return "", false, ErrValueNotSet
}
return req.Header.Get(param[4:]), true, nil
} else if strings.HasPrefix(param, "env:") {
v, have := os.LookupEnv(param[4:])
if !have {
return "", false, ErrValueNotSet
}
return v, true, nil
} else if strings.HasPrefix(param, "cookie:") {
cookie, err := req.Cookie(param[7:])
if err != nil {
return "", false, ErrValueNotSet
}
return cookie.Value, true, nil
} else if strings.HasPrefix(param, "req:") {
switch param[4:] {
case "query":
return req.URL.RawQuery, true, nil
case "path":
return req.URL.Path, true, nil
case "raddr":
return req.RemoteAddr, true, nil
case "rip":
val, _, _ := net.SplitHostPort(req.RemoteAddr)
return val, true, nil
case "host":
return req.Host, true, nil
default:
logf(req, logLevelWarning, "unknown req: param %#v", param[4:])
return "", false, ErrValueNotSet
}
} else if strings.HasPrefix(param, "jwt:") {
claimEndIdx := strings.Index(param[4:], ":") + 4
tokenString, solved, err := GetRequestParam(param[claimEndIdx+1:], req)
if !solved {
return "", solved, err
}
claims := jwt.MapClaims{}
if _, _, err := jwt.NewParser().ParseUnverified(tokenString, claims); err != nil {
logf(req, logLevelWarning, "cannot parse jwt from %#v: %s", param[claimEndIdx+1:], err)
return "", false, err
}
claimName, err := url.QueryUnescape(param[4:claimEndIdx])
if err != nil {
logf(req, logLevelError, "cannot unescape claim name %#v: %s", param[4:claimEndIdx], err)
return "", false, err
}
claim, have := claims[claimName]
if !have {
return "", false, ErrValueNotSet
}
return fmt.Sprintf("%s", claim), true, nil
} else if strings.HasPrefix(param, "unescape:") {
unescapeStr := param[9:]
if strings.Contains(unescapeStr, ":") {
unescapeStr, solved, err = GetRequestParam(unescapeStr, req)
if !solved {
return "", solved, err
}
}
unesc, err := url.QueryUnescape(unescapeStr)
if err != nil {
return "", false, err
}
return unesc, true, nil
} else if strings.HasPrefix(param, "tmpl:") {
tmplSrc, solved, err := GetRequestParam(param[5:], req)
if !solved {
return "", solved, err
}
h := sha256.New()
name := base64.StdEncoding.EncodeToString(h.Sum([]byte(tmplSrc)))
tmpl, have := tmplCache[name]
if !have {
tmpl, err = template.New(name).Funcs(template.FuncMap{
"rp": func(n string, req *http.Request) (ret string, err error) {
ret, _, err = GetRequestParam(n, req)
return
},
"b64url": base64.RawURLEncoding.EncodeToString,
"b64": base64.StdEncoding.EncodeToString,
"b64dec": base64.StdEncoding.DecodeString,
"b64decurl": base64.RawURLEncoding.DecodeString,
"json": json.Marshal,
"atoi": strconv.Atoi,
"stob": func(s string) []byte { return []byte(s) },
"map": func(args ...interface{}) (map[string]interface{}, error) {
if len(args)%2 != 0 {
return nil, errors.New("odd number of arguments")
}
ret := map[string]interface{}{}
for i := 0; i < len(args); i += 2 {
ret[args[i].(string)] = args[i+1]
}
return ret, nil
},
}).Parse(string(tmplSrc))
if err != nil {
logf(req, logLevelError, "Error parsing template %#v: %s", tmplSrc, err)
return "", false, err
}
if os.Getenv("DEBUG_RP_TMPL") != "" {
logf(req, logLevelInfo, "compiled template: %s -> %s", param, string(tmplSrc))
}
tmplCache[name] = tmpl
}
buf := bytes.NewBuffer([]byte{})
if err := tmpl.Execute(buf, map[string]interface{}{"req": req}); err != nil {
return "", false, err
}
if os.Getenv("DEBUG_RP_TMPL") != "" {
logf(req, logLevelInfo, "executed template: %s -> %s", param, buf.String())
}
return buf.String(), true, nil
}
return "", false, nil
}